Abstract
The addition of acoustic shields in the engine bay has shown the potential of reduction of powertrain exterior noise in the automotive industries. These shields are usually made by several layers of thermo-compressed porous materials. Some researches concerning the effect of compression on the acoustics properties of porous materials can be found in the literature. The effect of compression has been taken into account in the Biot-Allard model by modifying the physicals parameters (porosity, resistivity, tortuosity characteristic lengths,) versus to the compression rate n, defined as the ratio between nominal and compressed thickness. However, these laws are pointed out to be limited to a low compression rate (n<2). In our work, the compression rate can be attended to 10 for a porous material. New analytical laws are derived from the literature for the above mentioned physicals parameters. The static thermal permeability is also given as a function of compression rate in this paper. These laws take into ac...
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